FEB207

FEB207 Datasheet


FEB207-021 User Guide FAN2103

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FEB207-021 User Guide FAN2103

TinyBuck Integrated Synchronous Buck Evaluation Board

Featured Fairchild Product FAN2103
2008 Fairchild Semiconductor Corporation

Table of Contents

Board Configuration 3

Power-Up 3

Board Features 4 Switching Waveform 4 Enable / 4 Current Limit 4 Switching 4 Input 4 Output 5 Feedback Loop 5

Schematics 6

Bill of Materials 7

Assembly 8

PCB 8
2008 Fairchild Semiconductor Corporation

This guide supports the evaluation kit for the FAN2103 TinyBuck Integrated Synchronous Buck. This guide should be used in conjunction with the FAN2103 datasheet, located at Fairchild’s website

Overview

This board provides 1.8VOUT and 0-3A from 8-20VIN at a 500KHz switching rate using low-cost ceramic output capacitors.

Figure Evaluation Board and Required Connections

Board Configuration

Output Voltage Output Current Input Voltage Frequency:
1.8V 0-3A 8-20V 500KHz

Power-Up Sequence

Establish connections to test equipment as shown in Figure Use suitable diameter wires and connectors to avoid excessive voltage drop or temperature rise.

Do not turn on power supplies until all the connections are complete. Verify voltage sources have current limits adequately set to supply the load.

Apply VIN before VCC to avoid skipping the soft-start cycle. Apply the desired load current.

This can be done at any time, including before power-up, but it is recommended to power-up the first time with 0A load to verify proper connections.

To power down, turn off the VCC 5V supply first.
2008 Fairchild Semiconductor Corporation

Board Features

A ground strap is provided near the lower-left corner of the evaluation board to facilitate oscilloscope probe connections.

Switching Waveform Connect an oscilloscope probe to test point marked SW to view the switching waveform. Since the MOSFETs are integrated, gate/drive waveforms cannot be viewed.

Enable / Inhibit The momentary push-button switch S1 establishes a connection from EN to GND, inhibiting the FAN2103 when switching ceases and only standby current is consumed. A new soft-start cycle commences upon release of S1.

Current Limit The current limit threshold can be set lower by reducing R9. This feature is useful in applications where <3A is required, allowing the designer to select passive external components with lower current ratings. With R9 open, the FAN2103 enforces a maximum default current limit in excess of 3A.

Auto-Restart The board is configured for auto-restart with a delay C7 that increases linearly with C7. Refer to the datasheet for auto-restart or latch-off options.

Switching Frequency Switching frequency is set by R10 RT . Frequency may be lowered to 200KHz or raised to >600KHz. Large changes in frequency may warrant additional component value changes for the output filter and compensation network.

Input Voltage The demo board is optimized to work with an 8V to 20V input voltage range. For operating between 3V to 8V, modifications to output filter, compensation network component values, and R7 need to be made.
2008 Fairchild Semiconductor Corporation

Output Voltage

The output voltage is determined by the ratio of R1 and R4. For minor output voltage changes, adjust R4.

Larger VOUT changes may impact output filter and compensation network component value selection.

Feedback Loop Response

R5 opens the feedback loop for closed-loop response measurement. Remove R5 and connect a network analyzer or injection transformer in its place.
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Datasheet ID: FEB207 514467